Features
• Pin-compatible and functionally equivalent to ZBT™
• Supports 250-MHz bus operations with zero wait states
— Available speed grades are 250, 200 and 167 MHz
• Internally self-timed output buffer control to eliminate
the need to use asynchronous OE
• Fully registered (inputs and outputs) for pipelined
operation
• Byte Write capability
• Single 2.5V core power supply (V
• 2.5V I/O power supply (V
• Fast clock-to-output times
— 2.6 ns (for 250-MHz device)
• Clock Enable (CEN) pin to suspend operation
• Synchronous self-timed writes
• Available in JEDEC-standard lead-free 100-Pin TQFP,
lead-free and non-lead-free 119-Ball BGA and 165-Ball
FBGA packages
• IEEE 1149.1 JTAG-Compatible Boundary Scan
• Burst capability—linear or interleaved burst order
• "ZZ" Sleep Mode option and Stop Clock option
Logic Block Diagram-CY7C1370DV25 (512K x 36)
A0, A1, A
MODE
CLK
C
CEN
ADV/LD
BW
a
BW
b
BW
c
BW
d
WE
OE
CE1
CE2
CE3
ZZ
Cypress Semiconductor Corporation
Document #: 38-05558 Rev. *D
Pipelined SRAM with NoBL™ Architecture
)
DD
)
DDQ
ADDRESS
REGISTER 0
A1
D1
A0
BURST
D0
LOGIC
ADV/LD
C
WRITE ADDRESS
WRITE ADDRESS
REGISTER 1
REGISTER 2
WRITE REGISTRY
AND DATA COHERENCY
CONTROL LOGIC
READ LOGIC
SLEEP
CONTROL
•
198 Champion Court
18-Mbit (512K x 36/1M x 18)
Functional Description
The CY7C1370DV25 and CY7C1372DV25 are 2.5V, 512K x
36 and 1 Mbit x 18 Synchronous pipelined burst SRAMs with
No Bus Latency™ (NoBL™) logic, respectively. They are
designed to support unlimited true back-to-back Read/Write
operations with no wait states. The CY7C1370DV25 and
CY7C1372DV25 are equipped with the advanced (NoBL) logic
required to enable consecutive Read/Write operations with
data being transferred on every clock cycle. This feature
dramatically improves the throughput of data in systems that
require frequent Write/Read transitions. The CY7C1370DV25
and CY7C1372DV25 are pin-compatible and functionally
equivalent to ZBT devices.
All synchronous inputs pass through input registers controlled
by the rising edge of the clock. All data outputs pass through
output registers controlled by the rising edge of the clock. The
clock input is qualified by the Clock Enable (CEN) signal,
which when deasserted suspends operation and extends the
previous clock cycle.
Write operations are controlled by the Byte Write Selects
(BW
–BW
for
CY7C1370DV25
a
d
CY7C1372DV25) and a Write Enable (WE) input. All writes are
conducted with on-chip synchronous self-timed write circuitry.
Three synchronous Chip Enables (CE
asynchronous Output Enable (OE) provide for easy bank
selection and output three-state control. In order to avoid bus
contention, the output drivers are synchronously three-stated
during the data portion of a write sequence.
A1'
Q1
A0'
Q0
S
E
N
S
E
MEMORY
WRITE
ARRAY
A
DRIVERS
M
P
S
E
INPUT
E
REGISTER 1
,
•
San Jose
CA 95134-1709
CY7C1370DV25
CY7C1372DV25
and
BW
–BW
a
, CE
, CE
) and an
1
2
3
O
D
U
A
T
P
T
U
A
T
S
B
DQs
U
T
DQP
a
F
E
DQP
F
b
E
DQP
E
c
R
R
DQP
d
I
S
N
E
G
INPUT
E
REGISTER 0
•
408-943-2600
Revised June 29, 2006
for
b
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